package com.xiaoyy.app.extend.util;

import cn.hutool.core.codec.Base64;
import cn.hutool.crypto.SecureUtil;
import cn.hutool.http.HttpUtil;
import cn.hutool.setting.dialect.Props;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.xiaoyy.app.extend.common.vo.ConstantValue;
import com.xiaoyy.core.common.vo.WinxinVO;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.jasypt.util.text.BasicTextEncryptor;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.Charset;
import java.security.Key;
import java.security.Security;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

/**
 * @author: create by chenzh
 * @date:2020/06/21
 **/
public class WechatUtil {
    public static WinxinVO getSessionKeyOrOpenId(String code) {
        Props props = new Props("application.properties");
        String requestUrl = props.getProperty("system.config.winxin.url");
        String appid = props.getProperty("system.config.winxin.appid");
        String secret = props.getProperty("system.config.winxin.secret");
        Map<String, Object> requestUrlParam = new HashMap<>();
        // https://mp.weixin.qq.com/wxopen/devprofile?action=get_profile&token=164113089&lang=zh_CN
        //小程序appId
        requestUrlParam.put("appid", SecureUtil.aes(Base64.decode(ConstantValue.default_aes_key)).decryptStr(appid, Charset.forName("UTF-8")));
        //小程序secret
        requestUrlParam.put("secret", SecureUtil.aes(Base64.decode(ConstantValue.default_aes_key)).decryptStr(secret, Charset.forName("UTF-8")));
        //小程序端返回的code
        requestUrlParam.put("js_code", code);
        //默认参数
        requestUrlParam.put("grant_type", "authorization_code");
        //发送post请求读取调用微信接口获取openid用户唯一标识
        JSONObject jsonObject = JSON.parseObject(HttpUtil.post(requestUrl, requestUrlParam));
        WinxinVO winxinVO = new WinxinVO();
        winxinVO.setOpenId(jsonObject.getString("openid"));
        winxinVO.setSessionKey(jsonObject.getString("session_key"));
        return winxinVO;
    }
    /**
     * 解密userInfo信息
     * */
    public static WinxinVO decryptData(String encryptDataB64, String sessionKeyB64, String ivB64) {
        String ret = new String(
                decryptOfDiyIV(
                        Base64.decode(encryptDataB64),
                        Base64.decode(sessionKeyB64),
                        Base64.decode(ivB64)
                )
        );
        WinxinVO winxinVO = JSON.parseObject(ret,WinxinVO.class);
        return winxinVO;
    }

    private static final String KEY_ALGORITHM = "AES";
    private static final String ALGORITHM_STR = "AES/CBC/PKCS7Padding";
    private static Key key;
    private static Cipher cipher;

    private static void init(byte[] keyBytes) {
        // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
        int base = 16;
        if (keyBytes.length % base != 0) {
            int groups = keyBytes.length / base + (keyBytes.length % base != 0 ? 1 : 0);
            byte[] temp = new byte[groups * base];
            Arrays.fill(temp, (byte) 0);
            System.arraycopy(keyBytes, 0, temp, 0, keyBytes.length);
            keyBytes = temp;
        }
        // 初始化
        Security.addProvider(new BouncyCastleProvider());
        // 转化成JAVA的密钥格式
        key = new SecretKeySpec(keyBytes, KEY_ALGORITHM);
        try {
            // 初始化cipher
            cipher = Cipher.getInstance(ALGORITHM_STR, "BC");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 解密方法
     *
     * @param encryptedData 要解密的字符串
     * @param keyBytes      解密密钥
     * @param ivs           自定义对称解密算法初始向量 iv
     * @return 解密后的字节数组
     */
    private static byte[] decryptOfDiyIV(byte[] encryptedData, byte[] keyBytes, byte[] ivs) {
        byte[] encryptedText = null;
        init(keyBytes);
        try {
            cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(ivs));
            encryptedText = cipher.doFinal(encryptedData);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return encryptedText;
    }
    public static void main(String[] args){
        BasicTextEncryptor textEncryptor = new BasicTextEncryptor();
        //加密所需的salt(盐)
        textEncryptor.setPassword(com.xiaoyy.core.common.ConstantValue.JASYPT_ENCRYPTOR_PASSWORD);
        //要加密的数据（数据库的用户名或密码）
        String jhersqstb = textEncryptor.encrypt("b._*cGfd|Csxbz");
        String jhersqstbpwd = textEncryptor.encrypt("sNY1p0O6IadgBkA4vpLknAelb/VMHINoxpdA0kvOfcAVv9Q9z2rIJkdKGpZBSgsI");
        System.out.println(jhersqstb);
        System.out.println(jhersqstbpwd);
    }
}
